(39546) 1992 DT5

Dark Hoffmeister asteroid December 2022 yes (39546) 1992 DT 5 #D6D6D6 29 February 1992 UESAC La Silla Obs. (39546) 1992 DT 5 1999 TA 162 main-belt(middle)Hoffmeister 23 March 2018 (JD 2458200.5) 0 25.68 yr (9,378 d) 2.8587 AU 2.7254 AU 2.7921 AU 0.0239 4.67 yr (1,704 d) 276.01° 0.2113 ms / day 5.2622° 150.60° 304.53° 5.34 km (calculated) 1167 100 h 0.057 (assumed) C (assumed) 14.641 0.007 (R)14.714.88 0.3015.09 (39546) 1992 DT 5 is a dark Hoffmeister asteroid and exceptionally slow rotator from the central region of the asteroid belt, approximately 5.3 km mi off us in diameter. The likely elongated C-type asteroid was discovered on 29 February 1992, by the Uppsala–ESO Survey of Asteroids and Comets at ESO's La Silla astronomical observatory site in northern Chile. Orbit and classification 1992 DT 5 is an attributed member of the very compact Hoffmeister family (519), which, based upon its low albedo, was most likely formed from the breakup of a 50–100 kilometer-sized, carbon-rich parent body within the past several hundred million years. The family consist of nearly 2000 known members and its namesake is the asteroid 1726 Hoffmeister. It orbits the Sun in the central main-belt at a distance of 2.7–2.9 AU once every 4 years and 8 months (1,704 days; semi-major axis of 2.79 AU). Its orbit has an eccentricity of 0.02 and an inclination of 5° with respect to the ecliptic. The body's observation arc begins with its discovery observation at La Silla in February 1992. Physical characteristics 1992 DT 5 is an assumed carbonaceous C-type asteroid. The overall spectral type of the Hoffmeister family is that of a C- and F-type.23 Rotation period In September 2013, a rotational lightcurve for this asteroid was obtained from photometric observations in the R-band at the Palomar Transient Factory in California. It gave an exceptionally long rotation period of 1167 hours with an estimated error margin of ±100 hours. According to the Light Curve Data Base (LCDB), it is the 8th slowest rotating minor planet known to exist. Due to its high brightness amplitude of 0.80 magnitude, the body has a likely elongated shape (U=2). Diameter and albedo The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 5.3 kilometers based on an absolute magnitude of 15.09. Numbering and naming This minor planet was numbered by the Minor Planet Center on 26 May 2002 (M.P.C. 45660). As of 2018, it has not been named. References 2016-07-25 last obs. JPL Small-Body Database Browser: 39546 (1992 DT5) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2039546 Jet Propulsion Laboratory 11 April 2018 39546 (1992 DT5) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=39546 11 April 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 24 February 2018 Asteroid (39546) 1992 DT5 – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=39546#Asteroid%2039546EAR-A-VARGBDET-5-NESVORNYFAM-V3.0 27 October 2019 D. Nesvorný M. Broz V. Carruba December 2014 Identification and Dynamical Properties of Asteroid Families Asteroids IV 297–321 2015aste.book..297N 10.2458/azu_uapress_9780816532131-ch016 1502.01628 9780816532131 119280014 V. Carruba B. Novakovic S. Aljbaae March 2017 The Hoffmeister asteroid family Monthly Notices of the Royal Astronomical Society 465 4 4099–4105 2017MNRAS.465.4099C 10.1093/mnras/stw3022 free 1611.06176 Migliorini, F. Manara, A. di Martino, M. Farinella, P. June 1996 The Hoffmeister asteroid family: inferences from physical data. Astronomy and Astrophysics 310 681 1996A&A...310..681M 39546 11 April 2018 6 Adam Waszczak Chan-Kao Chang Eran O. Ofek Russ Laher Frank Masci David Levitan Jason Surace Yu-Chi Cheng Wing-Huen Ip Daisuke Kinoshita George Helou Thomas A. Prince Shrinivas Kulkarni September 2015 Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry The Astronomical Journal 150 3 35 2015AJ....150...75W 10.1088/0004-6256/150/3/75 1504.04041 8342929 6 Peter Veres Robert Jedicke Alan Fitzsimmons Larry Denneau Mikael Granvik Bryce Bolin Serge Chastel Richard J. Wainscoat William S. Burgett Kenneth C. Chambers Heather Flewelling Nick Kaiser Eugen A. Magnier Jeff S. Morgan Paul A. Price John L. Tonry Christopher Waters November 2015 Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 – Preliminary results Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 53493339 External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR https://web.archive.org/web/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (35001)-(40000) – Minor Planet Center 39546 2039546 39546 (39546) 1992 DT 5 039546 039546 039546 19920229